Oracle upgrade
Oracle upgrade Set NLS_LANG select * from v$nls_parameters where parameter like 'NLS_CHAR%'; − If NLS_CHARACTERSET has the value WE8DEC, set NLS_LANG to AMERICAN_AMERICA.WE8DEC ...

Oracle Real Application Cluster (RAC)
1. What is the Oracle Real Application Cluster (RAC)? Within the RAC, several Oracle instances access the same database. The Oracle instances can be located on different hosts. To keep the status of...